Asphalt-heater.



J. P.- DRISGOLL & H. THOMPSON.

ASPHALT HEATER. APPLICATION TILED AUG. 1, 1908.

Patented June 1, 1909.

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- By my WX J. P. DRISCOLL & H. THOMPSON.

ASPHALT HEATER.

APPLICATION FILED AUGJ, 190a.

Patented June 1, 1909.

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STATES Jonas r. innseoLL AND HARRY 'rnonrsou, or sr. LOUIS, nrssouin; sun 'llilrblPsw? rnrnn'r cri ic-n ASSIGNOR OF ONE-SIXTH OF HIS RIGHT TO SAID DRISVOLL.

ASPHAL'JLHEATEB.

Patented June 1 1909.

Serial No. 446,484.

To all ir/wmit may concern:

lie it known that we, JAMES F. DmsooLL and HARRY; Tnonr; on, both citizens of the Unit-ed States of America, residing at the city of St. llouis, in. the State of Missouri, have invented certain new and useful linprovements in Asphalt-Heaters of which,

the following is a full,'clear, and exactde- I scription, reference being had to the accompanylng drawings,--forming part of this specification.

Our invention relates to the connection with a steam roller such as employed for rolling streets or roadways, of a heater by which asphalt in asphalt streets may .be heated when it is desired to 'removeportions of the asphalt and replacethe removed portions in making repairs.

The object of ourinvention is to provide a simple, inexpensive and eiiicient asphalt heater that may be readily applied to any steam roller and whereby the roller may, in addition to its usual capacity, serve also as a carrier for the heater and the boiler of the roller may'serve as the means for supplying steam for-the operation of the heater.

By the connection stated, we are enabled to operate the heater at a much lower cost and with a much less expenditure of steam than that incurred in the use of an asphalt heating apparatusused exclusively for making' repairs in asphalt streets and in which the steam in the apparatus is utilized as a propelling power for the apparatus inaddition to its utility to supply the asphalt heater. F

Figure I is a side elevation of a steam roller shown in dotted lines, and oilr asphalt heater carried by the frame of said roller. Fig. II is an enlarged front elevation of the upper portion of the hood of the heater, the connecting pipe lea dingi thereto and the combustion chamber. "Fig. III. is an enlarged horizontal section. taken on line III- I II, Fig. I. Fig. IV isfl'a n enlar ed vertical section taken 'on line IVQ- Fig. I, through the lower portion of, the hood of the heater and .one of the side. guard plates. Fig. V is an enlarged verticallongitudinal section-taken through the heater. Fig; VI an enlarged vertical cross section taken through the hood of the heater. Fig. VII is an enlgrged top or plan view of the rear portion of the combustion chamber of the healer and the steainand. fuel pipes leading to said combustion chamber. Fig. V is i, a vertical cross section taken on line Vlll- VIII, Fig. V.

In the accompanying drawings: A designates a steam roller that may be of any' usual type and comprises a suitable frame. a roller cylinder and a steam boiler.

1 designates the elevated combustion box of our asphalt heater which is secured to the 1 frame of the roller A by side braces 2- and 3, the former of which are disposed l101lZ011- tally and the latter of which are arranged at an incline to brace the foru'ier, seen in Fig. I. ',These supports extend beyond the forward or rear end of the roller frame and the combustion box is located. in front of the forward end of said frame.

The combustion box 1 preferably consists of an outer shell and a fire brick lining within said shell and it contains a combined oil and steam combustion chamber 4. At the forward end of the combustion chamber is a hollow neck into which the products of coinbustion are discharged from the combustion chamber l.

r 6 is'a steam conducting pipe leading from the steam boiler of the steam roller A and at the rear end of the combustion box 1.

8 is an oil conducting pipeleading from an oil tank 9 supported by the steam roller .A to the rear end of the combustion box and to which pipe',- in conjurlction with the branch 7 of the steam pipe 6, is applied aburner .10 that extends into the combustion chamber: f of said combustion box, see Fig. i V. The fuel conducting pipe 8 serves to convey fuel to the burner lO and as the fuel escapes into said burner, its combustion is promoted by steam passing over from the boiler of the steam roller through the steam pipe 6 and its branch 7.

12 designates a centrally located elbow of the combustion box and 12 is a hood hav- 1' mg at its lower end, feet 12 whereby the hood is supported a. few inches from the end a centrally located neck 13 that is slidably fitted to the line 11. As the fuel is combusted in the combustion chamber 4: it passes from said chamber through the neck 5 into .the flue 11 from which it is discharged downwardly intothe hood 12 of the heater which is located in the use of the apparatus having a branch 7 that occupies a position flue extending downwardly from the neck-Q surface of the pavement and at. its upper asphalt in a street is to immediately above the point-at which the be heated for the purpose of-softeiiing it in order that it may be removed preparatory to making a repair in the street.

In order that the products'of combustion may be properly distributed beneath the hood 1 2 and delivered evenly over the surfaoe'to be heated, we arrange 'within'said :hood a pair of outwardlycurvedside de fleeting plates '1 and a central dividing plate 15, see Figs. III and VI 16 designates guards located at the sides of the'hood 12 and connected to the walls of portions the" hood by hinge links 1?. These guards are adapted to be lowered to positions alongside of the .walls of the hood andlupon the portions ofthe street being'he'ated as illustrated in the drawings in order that they will protect the "surface surrounding the of heating. medium to the surrounding surface, It willbe seen, by reference to Figs.

IV, V and VI, that til? lower edge of the nected to the piston rod 19 that operates in I the cylinder 20 of the steam ram. Vithin the cylinder 20 isa piston (not shown) that is adapted'to be elevated under pressure of steam conducted to the cylinder from a being heated and prevent the flow branch steam pipe 6 that leads from an extension 6 of the steam conducting pipe 6. The steam pipe extension 6 leads into the flue ll of the heater and is provided inieriorly of said flue with a nozzle 21 that acts'to create suction in said flue to draw products of combustion from the combustion chamber l and force them downwardly into the hood of the beaten r i We claim:

1-. In an asphalt heater, 'thecombination of a hood, means for" supporting the hood out of contact with the asphalt surface and means for delivering a heating agent to the r interior of said hood downwardly through the center of the top'thereoffor direct play I upon the asphalt surface, substantially as set forth. a

2. In an asphalt heater,the combination of a hood, means for delivering a heating agent to the interior of said hood, and

guards attached to said hood and adapted torest upon hood, substantially as set forth.

3. In an asphalt heater, the combination of a hood, mea'ns'for deliveringa heating agent to the interior of said hood, and guards movably connected to said hood and adapted to rest upon 'the pavement apart from the hood; substantially-as set forth;

4. In an asphalt heater, the, combination of a hood, means-for delivering a heating agent to the interior of said booth and guards hinged to said hood atthe bottom of its walls and adapted torest upon the pavement apart from the booth v JAMES F. DRTSCOLL. HARRY TTH'H'IPSON. In preSenceof- I Bmxcnn PlOGAK,

E. lllxuml n'ronx' the pavement apart from the 

